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How is a medium characterized?

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in Clinical Science by (102k points)
How is a medium characterized?

(a) By its thickness

(b) By its acoustic impedance

(c) By its water content

(d) By its density

I had been asked this question in exam.

My doubt stems from Ultrasound topic in division Diagnostic Investigation via Imaging Techniques of Clinical Science

1 Answer

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Right option is (b) By its acoustic impedance

Easy explanation: Acoustic impedance is the resistance that a sound wave faces when it propagates from one medium to another in the body. Thickness, density and water content (for a living body) are all factors that are taken into account when measuring the acoustic impedance. Thus the medium is characterized by its acoustic impedance. The impedance offered by the bones is extremely high.

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